Roller bit



FIG. 1 is a top plan view of a roller bit showing my new design.

FIG. 2 is a side elevational view taken in the direction of any one of the three arrows 2 in FIG. 1;

FIG. 3 is a side elevational view taken in the direction of any one of the three arrows 3 in FIG. 1.

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a roller bit, as shown and described. 